The 2009 All-Japan Formula Three Championship was the 31st edition of the All-Japan Formula Three Championship. It commenced on April 4, 2009 and ended on September 27.
Marcus Ericsson became the first Swedish champion, after a title battle which went down to the final round in Sportsland SUGO. Ericsson won with 112 points, beating his teammates Takuto Iguchi with 103 points, and Yuji Kunimoto with 97 points.
All teams were Japanese-registered.
Bold – Pole
Italics – Fastest Lap
Bold – Pole
Italics – Fastest Lap